What's the point of NSAssert, actually?

Question

I have to ask this, because: The only thing I recognize is, that if the assertion fails, the app crashes. Is that the reason why to use NSAssert? Or what else is the benefit

Answer 1

NSAssert make app crash when it match with the condition. If not match with the condition the next statements will execute. Look for the EX below:

I just create an app to test what is the task of NSAssert is:

    - (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [self testingFunction:2];
}

-(void)testingFunction: (int)anNum{
    // if anNum < 2 -> the app will crash
    // and the NSLog statement will not execute
    // that mean you cannot see the string: "This statement will execute when anNum < 2"
    // into the log console window of Xcode
    NSAssert(anNum >= 2, @"number you enter less than 2");
    // If anNum >= 2 -> the app will not crash and the below 
    // statement will execute
    NSLog(@"This statement will execute when anNum < 2");
}

into my code the app will not crash.And the test case is:

• anNum >= 2 -> The app will not crash and you can see the log string:"This statement will execute when anNum < 2" into the outPut log console window
• anNum < 2 -> The app will crash and you can not see the log string:"This statement will execute when anNum < 2"